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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |
Net actuarial loss, tax expense (benefit) | $ 230 | $ 899
Pension settlement expense, tax | 349 | 168
Amortization of unrecognized net periodic benefit costs, tax | 100 | 219
Change in unrealized income (loss) on interest rate swap, tax (benefit) | (118) |
Change in unrealized income (loss) on interest rate swap, tax expense |  | 219
Change in foreign currency translation, tax expense (benefit) | $ 79 | $ (223)

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- Definition Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 + Details
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